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loop/swap/tx.go

65 lines
1.4 KiB
Go

package swap
import (
"bytes"
"errors"
"fmt"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
)
// EncodeTx encodes a tx to raw bytes.
func EncodeTx(tx *wire.MsgTx) ([]byte, error) {
var buffer bytes.Buffer
err := tx.BtcEncode(&buffer, 0, wire.WitnessEncoding)
if err != nil {
return nil, err
}
rawTx := buffer.Bytes()
return rawTx, nil
}
// DecodeTx decodes raw tx bytes.
func DecodeTx(rawTx []byte) (*wire.MsgTx, error) {
tx := wire.MsgTx{}
r := bytes.NewReader(rawTx)
err := tx.BtcDecode(r, 0, wire.WitnessEncoding)
if err != nil {
return nil, err
}
return &tx, nil
}
// GetScriptOutput locates the given script in the outputs of a transaction and
// returns its outpoint and value.
func GetScriptOutput(htlcTx *wire.MsgTx, scriptHash []byte) (
*wire.OutPoint, btcutil.Amount, error) {
for idx, output := range htlcTx.TxOut {
if bytes.Equal(output.PkScript, scriptHash) {
return &wire.OutPoint{
Hash: htlcTx.TxHash(),
Index: uint32(idx),
}, btcutil.Amount(output.Value), nil
}
}
return nil, 0, fmt.Errorf("cannot determine outpoint")
}
// GetTxInputByOutpoint returns a tx input based on a given input outpoint.
func GetTxInputByOutpoint(tx *wire.MsgTx, input *wire.OutPoint) (
*wire.TxIn, error) {
for _, in := range tx.TxIn {
if in.PreviousOutPoint == *input {
return in, nil
}
}
return nil, errors.New("input not found")
}